Cleaver-Brooks Profire E Series, Установка, эксплуатация и обслуживание, Страница: 76 / 84

LNE Series FGR System
8-2 750-297
Profire E/LNE Series Manual
8.2 — FGR Shutoff Valve
The FGR Shutoff valve is located as close to the stack as
possible. A modutrol motor with a 90º stroke opens and
closes the FGR shutoff valve in 15 seconds. Proof of
closure for the shutoff valve is provided by an auxiliary
switch in the modutrol motor. The modutrol motor has a
maximum temperature rating of 150º F. This valve
should never be mounted with the motor shaft in a
vertical position. Damage to the modutrol motor will
result. During pre-purge and post-purge, the FGR
shutoff valve is closed to prevent any unused gas fumes
from returning to the combustion zone.
FIGURE 8-2.
FGR Shutoff Valve
8.3 — FGR Control Valve
The FGR control valve is mounted to the FGR damper on the burner. A burner mounted modutrol motor with link- age
connections coordinates the air, fuel and NO
x
control devices to provide proper fuel/air/NO
x
ratios through the firing
range. The modutrol motor must be able to complete its full travel range. Restrictions will damage the motor and/or the
linkage. Linkage consists of adjustable levers, rods and ball joints that transmits motion from the modutrol motor to the
FGR control valve. Lever and rod adjustments should be made with the motor in the low fire position. The angles of the
driven levers on the modutrol motor jackshaft can be adjusted to vary the rate of change. The closer the rod is to the
level, hub, the less distance the rod and control valve blade will travel.
Before starting the boiler, make sure the control valve is closed. The boiler must never be operated if the control valve is
open. This will result in hot combustion gases flowing backwards in the system. This will damage the system and can cause
bodily harm.
! Warning